China on Wednesday reported surprisingly weaker growth in industrial output and retail sales for April, reinforcing expectations that Beijing needs to roll out more stimulus measures as the trade war with the United States escalates. Investment also stumbled unexpectedly, suggesting China's economy is still struggling for better footing even as a sharp hike in U.S. tariffs on Friday ratcheted up pressure on its exporters. Growth in industrial output slowed more than expected to 5.4 percent in April from a year earlier, pulling back from a surprising strong 4-1/2 year high of 8.5% in March, which some analysts had suspected was boosted by seasonal and temporary factors.